| //===-- LibcGlue.cpp ------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // This file adds functions missing from libc on older versions of linux |
| |
| #include <cerrno> |
| #include <lldb/Host/linux/Uio.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #if !HAVE_PROCESS_VM_READV |
| // If the syscall wrapper is not available, provide one. |
| ssize_t process_vm_readv(::pid_t pid, const struct iovec *local_iov, |
| unsigned long liovcnt, const struct iovec *remote_iov, |
| unsigned long riovcnt, unsigned long flags) { |
| #if HAVE_NR_PROCESS_VM_READV |
| // If we have the syscall number, we can issue the syscall ourselves. |
| return syscall(__NR_process_vm_readv, pid, local_iov, liovcnt, remote_iov, |
| riovcnt, flags); |
| #else // If not, let's pretend the syscall is not present. |
| errno = ENOSYS; |
| return -1; |
| #endif |
| } |
| #endif |
